GENERAL INTRODUCTION
Pad-mounted transformers are made in power ratings from around 75 to around 5000 kVA and often include built-in fuses and switches. Primary power cables are connected with elbow connectors, which can be operated when, energized using a hot stick and allows for flexibility in repair and maintenance.
The pad mounted transformer produced by Pearl Electric is designed and tested in accordance with industry standards including IEC, CSA, ANSI C.57, DOE and IEEE as applicable.
CONSTRUCTION OF PADMOUNT TRANSFORMER
• CORE
The three-legged, step-lap mitered core construction is manufactured using a high-quality cutting machine. For maximum efficiency, cores are precisely stacked, virtually eliminating gaps in the corner joints.
Five-legged wound core or shell-type triplex designs are used for wye-wye connected transformers, and other special transformer designs.
Cores are manufactured with precision cut, burr-free, grain-oriented silicon steel. Many grades of core steel are available for optimizing core loss efficiency.
• COILS
Pad-mounted transformers feature a rectangular coil configuration with wire-wound, high-voltage primaries and sheet-wound secondary. The design minimizes axial stress developed by short circuits and provides for magnetic balancing of tap connections.
Coils are wound using the highest quality winding machines providing exacting tension control and conductor placement for superior short-circuit strength and maximum efficiency. Extra mechanical strength is provided by diamond pattern, epoxy coated paper insulation, used throughout the coil, with additional epoxy at heavy stress points. The diamond pattern distribution of the epoxy and carefully arranged ducts, provide a network of passages through which cooling fluid can freely circulate. Coil assemblies are heat-cured under calculated hydraulic pressure to ensure performance against short-circuit forces.
TANKS
Transformer tanks are designed for high strength and ease of handling, installation, and maintenance. Tanks are welded using precision-cut, hot rolled, pickled and oiled steel. They are sealed to protect the insulating fluid and other internal components.
Transformer tanks are pressure-tested to withstand 7 psig without permanent distortion and 15 psig without rupture.
TECHNICAL DATASHEET FOR 1500KVA PADMOUNT TRANSFORMER
ITEM | ZGSB-1500/13.8/0.4 |
Manufacturer | Pearl Electric Co., Ltd. |
Standard | IEEE 57 |
Transformer Type | Pad-mount Transformer |
Primary Voltage | 13.8KV(H.V) |
Secondary Voltage(L.V) | 0.4KV(L.V) |
Rated Rating | 1500KVA(H.V)/1500KVA(L.V) |
Temperature Rise | 65°C(H.V)/65°C(L.V) |
Impedance (Uk=) | 4% at 1500KVA |
Insulation Class | A-Class |
Phase | 3 phase |
Frequency | 60hz |
Cooling Way | ONAN |
Insulation Liquid | Mineral oil |
Winding Material | Copper |
Core Material | STAINLESS STEEL |
Vector Group | Dyn1 |
